SI-111-PW Infrared Radiometer for Prewired Enclosures
Determine an Object's Surface Temperature without Physical Contact
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

Overview

The SI-111-PW, manufactured by Apogee, is a version of our SI-111 that is fitted with a connector for attachment to a prewired enclosure. This precision infrared radiometer determines the surface temperature of an object without physical contact. The SI-111-PW measures both the subject's surface temperature and the sensor-body temperature. A Campbell Scientific datalogger uses these measurements to calculate the correct temperature of the subject.

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Benefits and Features

  • Cable connects directly with a prewired enclosure
  • Compatible with most Campbell Scientific dataloggers
  • Measures surface temperature continuously in the field
  • Provides road surface, plant canopy, soil surface, snow surface, and water surface temperature measurements
  • Avoids influencing the temperature, providing more accurate measurements
  • Ideal for providing spatial averages
  • Rugged construction—two temperature probes housed in an aluminum body with a germanium window

Images

Field of View (FOV)

Detailed Description

The SI-111-PW consists of a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature sensors are housed in a rugged aluminum body that contains a germanium window.

Both the thermopile and the thermistor output a millivolt signal that most of our dataloggers can measure. The datalogger uses the Stefan-Boltzman equation to correct for the effect of sensor body temperature on the target temperature. The corrected readings yield an absolute accuracy of ±0.2°C from -10° to +65°C.

Field of View (FOV)

The SI-111-PW has a 22-degree half-angle field of view (FOV). The FOV is reported as the half-angle of the apex of the cone formed by the target (cone base) and the detector (cone apex). The target is a circle from which 98% of the radiation viewed by the detector is being emitted.

Specifications

Input Power 2.5 V excitation (for thermistor)
Response Time < 1 s (to changes in target temperature)
Target Temperature Output Signal 60 μV per °C difference from sensor body
Body Temperature Output Signal 0 to 2500 mV
Optics Germanium lens
Wavelength Range 8 to 14 μm (corresponds to atmospheric window)
Field of View (FOV) 22° half angle
Operating Temperature Range -55° to +80°C
Operating Relative Humidity Range 0 to 100% RH
Cable Description 4.5 m (14.76 ft) twisted, shielded 4-conductor wire with Santoprene casing, ending in pigtails
Absolute Accuracy
  • ±0.2°C (-10° to +65°C)
  • ±0.5°C (-40° to +70°C)
Uniformity
  • ±0.1°C (-10° to +65°C)
  • ±0.3°C (-40° to +70°C)
Repeatability
  • ±0.05°C (-10° to +65°C)
  • ±0.1°C (-40° to +70°C)
Diameter 2.3 cm (0.9 in.)
Length 6 cm (2.4 in.)
Weight 190 g (6.7 oz)

Compatibility

Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Dataloggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR800
CR850
CR9000 (retired)
CR9000X

Additional Compatibility Information

Mounting

The SI-111-PW is often fastened to a CM200-series crossarm, a tripod or tower mast, or a user-supplied pole using a CM230, CM230XL, or CM220 mount. The CM230 and CM230XL are adjustable inclination mounts that allow the SI-111-PW to be mounted perpendicular to the target surface when the target surface is on an incline. The CM230XL is similar to the CM230, but the CM230XL places the SI-111-PW further from the pole or crossarm. The SI-111-PW may also be attached directly to a user-supplied camera tripod.

Connections

The cable on the SI-111-PW is fitted with a connector that attaches to a prewired enclosure.


Frequently Asked Questions

Number of FAQs related to SI-111-PW: 7

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  1. The window in the Apogee infrared sensor is inset and protected, but it can become partially blocked in three ways:

    1. Spiders can make a nest in the entrance. Campbell Scientific recommends using a cotton swab to apply a spider repellent around the entrance to the aperture. Do not apply the repellent, however, to the sensor window itself.
    2. Calcium deposits can accumulate on the window if irrigation water sprays up on the head. These deposits typically leave a thin white film on the surface, which can be removed with a diluted acid, such as vinegar. Calcium deposits cannot be removed with solvents such as alcohol or acetone.
    3. In windy environments, dust and dirt can be deposited in the aperture. The aperture can be cleaned with deionized water, rubbing alcohol, or in extreme cases, acetone.

    Clean the inner threads and sensor window using a cotton swab dipped in the appropriate solvent. For additional cleaning information, see the Maintenance section of the instruction manual.

  2. As a general recommendation, recalibration should be done every two years. 

  3. There are two accuracy specifications listed for the SI-111:

    • One for when the difference in the target and sensor body temperatures is less than 20°C (more accurate)
    • One for when the difference in the target and sensor body temperatures is greater than 20°C (less accurate)

    Using a radiation shield with the sensor helps keep the sensor body temperature in close approximation to the ambient air temperature. Ultimately, the need to protect the sensor from short-wave radiation is dependent on what is being measured and under what conditions. For example, Campbell Scientific recommends using a radiation shield for canopy measurements.

  4. The SI-111 has been successfully calibrated with a maximum cable length of 100 m without a loss in accuracy. Ideally, the sensor is calibrated with the overall cable length already configured. Our tests have shown, however, that adding a few meters of cable in the field has a negligible effect on the calibration, provided the measurement device has significantly high input impedance, such as with the CR1000.

  5. The SI-111 can be used to measure a wide variety of surfaces, including water and snow. When measuring objects with low emissivity, however, it is particularly important to apply corrections to the measurement. 

  6. The information included on a calibration sheet differs with each sensor. For some sensors, the sheet contains coefficients necessary to program a datalogger. For other sensors, the calibration sheet is a pass/fail report.

  7. This depends on the information contained in the calibration sheet:

    • If the calibration sheet contains coefficient information, Campbell Scientific keeps a copy, and a replacement copy can be requested.
    • If the calibration sheet does not contain coefficients, Campbell Scientific does not keep a copy. It may be possible to contact the original manufacturer for a replacement copy.

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